计算时间

Now some problems are computationally hard, which means that they are not solvable even given infinite time.

现在，一些问题是很难计算，这就意味着他们没有解决甚至无限时间。

In Chapter 4, we provide a linear time solvable case of the model and present a polynomial optimal algorithm for this special case.

在第四章中，我们给出本模型的一个多项式时间可解的特殊情况，设计了一个计算复杂性为O的最优算法。

We are the first in China to apply the recent " universal variables " concept to the orbit designing of deep space probe .

给出了利用普适变量法来求解飞行时间，开普勒问题和高斯问题的计算方法，将这些方法用于深空探测器的轨道设计，针对不同要求提出了 3种改进设计的方法，对每种方法的适用范围进行了详细的分析。

In order to test spectral element method and Newmark time integral, the codes of program and the feasibility of spectral element method for aeroacoustics, One question which has analytical solution and two typical questions of computational aerocaustics are simulated numerically by the program.

为了验证谱元方程和Newmark时间积分方法的正确性、自己所编程序代码的有效性以及谱元方法求解气动声学问题的可行性，本文使用程序分别求解了具有解析解的波动方程和计算气动声学问题中的两个典型问题。

It is the study of the use of spherical coordinates to determine how the objects projected on the celestial sphere depending on the location, and study these changes depending on location laws and causes, offered to time depending on location of celestial calculation of parameters of the basis and method, as all the astronomical observations necessary for the basics, the main means of spherical trigonometry math and matrix operations.

它所研究的是怎样利用球面坐标确定天体投影在天球上的视位置，并研究这些视位置变化的规律和产生原因，提出以时间为参数的计算天体视位置的依据和方法，成为一切天文观测所必需的基础知识，主要的数学手段是球面三角学和矩阵运算。

This research uses high sensitive piezoelectric sensor for developing a sensitive sphygmograph to detect anthropic pulse and to determine parameters to diagnose physiology of human. From spectrum of pulse, the analysis processes are to determine the high pass frequency used in the analysis, uses the IIR Buttorworth filter to remove the noise, to calculate the Hermite curve for filtering the oscillation parts caused by breathe, then to calculate the parameters in strength, time and angle domains from the processed signal to study their correlation with the physiology of the studied experimenters and compared the results with the machine from the market.

中文摘要本研究采用高灵敏度压电感测元件，发展敏锐的脉搏感测仪器，量测人体手腕脉搏波形，计算其中所包含之参数来探讨与研究人体生理状况相关性的适用性；藉由分析脉搏频谱成份并使用Buttorworth滤波器过滤高频杂讯，再使用Hermite方程式去除手腕低频振动杂讯，由过滤后的脉搏讯号萃取振幅强度、波形上升与下降时间、上升与下降角度等参数，经由统计分析探讨与人体生理之情况相关性，并将所获得指标结果与市售仪器所量测之数据变化进行比较。

Through observing the real sky, the 2037 star maps continuously are calibrated and calculated in integration time of every star map of 80 ms.

通过实际星空观测，对连续拍摄的2037幅星图进行标定计算，每幅星图的积分时间为80 ms。

They can save a lot of time and money in start-up procedure calculations.

在开工过程计算中，它们可以节约大量的时间和资金。

The calculated results, which include the stationary electron distribution and characteristic time for beams to reach the stationary distributions, are analyzed and discussed.

对计算所得的稳态电子分布函数以及达到稳态分布所需的特征时间进行了分析和讨论。

The killing probability expressions and statistical property of the stationary time series are obtained, and their relative formulae under different shotting characteristics are given.

给出滞留射击方式下滞留时间序列毁伤概率及统计特性的数学描述，并得到不同射击特性下的相关计算公式。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。