查询词典 instants

The 3-D thermal weight function method was proposed, in which the works ussually done for finite element stress analyses for every time instants could be avoided, and the transient stress intensity factor of a body subjected to thermal shock can be calculated through direct integration of products of temperature fields and TWF.

在国际上首次以三维热权函数法为核心，绕过对每一时刻有限元应力分析这一步，直接通过温度场与热权函数的乘积的积分来计算热冲击应力强度因子K的过渡过程，极大地提高了计算效率。

The results show that the MDFA results almost do not depend on length of subseries, and ApEn could identify dynamic structure to some extent but still depend on the lengths of subseries. At the same time, there exists a huge drift for the ApEn results which means the actual time-instants of abrupt change don't overlap with the detected one.

结果表明，新方法的检测结果几乎不依赖于子序列的长度，而ApEn虽然能在一定程度上识别系统的动力学结构突变区间，但其检测结果依赖于子序列长度，且不能准确地检测出突变点的位置。

The main contents are as follows.1 For the state control problem in closed quantum systems, according to the distance between states, the error between states and the average value of an imaginary mechanical quantity, three Lyapunov functions are chosen, respectively. The corresponding control law designs and the convergence analyses are studied. Especially, for the Lyapunov function based on the distance between states, a class of control laws that can solve the problem that an initial state is orthogonal to a goal state is designed. The convergence of the system is analyzed via LaSalle\'s principle and one method to find the largest invariant set of the closed loop system is proposed by linearizing the unitary evolution operator at the corresponding instants.

在这一背景下，本论文在指出研究量子系统控制的必要性、回顾量子系统控制理论和方法的研究现状的基础上，从控制理论的角度研究Lyapunov理论和最优控制理论对于封闭量子系统的应用以及开放系统中的若干问题，主要内容包含以下几个方面。1针对封闭量子系统中的状态控制问题，根据状态间的距离、状态间的偏差、一个虚拟力学量的均值，分别选择三种Lyapunov函数进行相应的控制律设计和收敛性分析。

Scientists will soon be able to observe the first instants after a nuclear warhead detonates.

家不久将能观察到核弹头爆炸的第一瞬间。

Scientists will soon be able to observe the first instants after a nuclear warhead detonates.

&ASCI紫色计算机&将被用于三维模拟核爆炸科学家不久将能观察到核弹头爆炸的第一瞬间。

These are people who time the instants when stars are occulted by skyscraper walls and determine the rate of precession of the Earth's axis.

许多曾经很普遍的天文现象现在已需要昂贵的设备、大量的金钱和时间，到远离城市的郊外才能一睹她的芳容。

These are people who time the instants when stars are occulted by skyscraper walls and determine the rate of precession of the Earth's axis.

许多《天空和望远镜》的读者可以在计算机屏幕上跟踪公元前3000年冥王星的运动轨迹，但却无法在户外的光污染中找到北极星。

In the neighboring room, the sound of iron articles being moved was audible. She smoothed her hair with the palm of her hand, and smiled into the mirror, humming with her cracked and sepulchral voice:-- Nos amours ont dure toute une semaine,[28] Mais que du bonheur les instants sont courts!

况且，在容德雷特家里，没有一个人活动，没有一个人说话，声息全无，那里的寂静是冰冷和深沉的，要是没有这一点火光，马吕斯会以为他是在坟墓的隔壁。

It's worse than Fire where you just spam instants and hope you get crits.

这甚至比火系更差。

We are all brief instants of the world.

我们都是世界的一瞬。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。