A model of the photon avalanche in a four level coupled system is proposed.
提出了四能级耦合系统的光子雪崩上转换模型。
To shorten the matching time, the four level fractal approximation coding based on matching in neighborhood is presented.
为了缩短分形编码中值域块与定义域块池中的定义域块逐一匹配时间，提出了四级邻域匹配分形近似编码。
In this study, a three factor and four level orthogonal experiment was designed to study the biologic effect of ultrasonic radiation on Marine Chlorella.
设计了一个超声频率、超声功率和辐射时间三因素四水平的正交实验，研究超声辐射对海水小球藻的生物效应。
In the analysis, both the coupled vibration of four level structures under earthquake and the randomness of spread directions of input seismic waves were considered.
在分析中，考虑了四层高架结构在地震时的耦合振动作用，以及地震波传播方向的任意性。
After analyzed customer loyalty and the relevant concepts and it's essence, pointed the four level of customer loyalty and the value of customer loyalty hase been analyzed also.
通过界定顾客忠诚的概念、内涵，本质，指出了顾客忠诚的四个层次和顾客忠诚的价值。
The rate equations for a continuous four level laser are solved in this letter, taking into account the finite lower level lifetime and the crystal field splitting of the laser levels.
在考虑了有限的下能级寿命和激光能级与晶格场的相互作用的基础上，对四能级激光的速率方程组进行了求解。
Conversely, chemical engineers straight out of school can easily make almost four times the wages of an entry-level high-school graduate.
相反，刚从大学毕业的化学工程师的工资几乎是入门级高中毕业生的四倍。
In fact, real benefit levels were lower in the 1970s than they were in the 1940s, and in most states the maximum benefit was below the poverty level for a family of four.
事实上，20世纪70年代的实际福利水平比20世纪40年代的要低，而且在大多数州，四口之家的最高福利都低于贫困线。
According to a study by Australian National University, Australian children and Chinese children have the same level of eyesight before they start school, but once they enter primary school, Chinese children only spend about an hour a day outside, while Australian children spend three to four hours each day in the sunshine.
澳大利亚国立大学的一项研究显示，澳大利亚的孩子和中国的孩子在入学前的视力水平相同。但是一旦他们进入小学，中国的孩子每天只会在户外度过一个小时，而澳大利亚的孩子每天在阳光下待三到四个小时。
There are four units in one level.
每层有四套房子。
Using our hierarchy, we can easily imagine a four-level process configuration for a large organization, as shown in Figure 2. Each layer contributes to the process above it.
用我们的层次，我能很容易就能够想象一个大的组织的四层过程结构，如图2所示。每一个层次会对它上面的过程有所帮助。
An index of pending home sales fell unexpectedly to its lowest level in four years in March.
一个衡量待售房屋的指数在三月降至出乎意料的四年最低水平。
You will find that we page cache four of the six top level menu choices.
您会发现我们会页面缓存六个顶端菜单中的四个。
This catalog contains four top-level categories.
该目录包括四个顶级种类。
Often the simple services of level four are replaced by composite services that can be choreographed.
第四级的简单服务通常会被复合服务替代，后者可以进行组合。
Share prices are almost four times their level in early 2003.
股票价格几乎是2003年初的四倍。
Figure 1 shows four high-level components, each with its own web service interface, that comprises a Eucalyptus installation
图1 中显示了四个高级组件，每个都有自己的web服务接口，其中包含 Eucalyptus 安装
Of that group, 63 people had blood mercury levels more than twice the recommended level and 19 showed blood mercury levels four times the level considered safe.
在这一组人中，63人血液中汞含量是建议值的两倍以上，而且有19人血液中汞含量是认可安全值的4倍。
The average number of initial claims over the last four weeks fell to the lowest level in four months.
之前四周的初次申领失业救济(Initial Claims)人数平均值降至四个月内的最低点。
Solid laser is a four-level system.
固体激光器是一个四能级系统。
The time characteristics of a pulsed ti: sapphire laser have been studied theoretically based on the rate equation of four-level system.
本文从四能级结构激光速率方程出发，对脉冲掺钛蓝宝石激光器的时间特性进行了理论研究。
In the closed microcavity of an ideal four-level laser system, when nonradiative depopulation is zero, the light output property of the microcavity laser is linearly.
在封闭腔，对理想的四能级激光系统，无辐射衰减速率为零时微腔激光器的光输出特性是线性的。
A data transformation interface was developed to get the four-level product model.
开发了数据转换接口，获得了四层次的产品模型。
The temporal behavior of DFWM and holography in four-level saturable and reverse saturable absorbers was analysed theoretically.
对四能级饱和与反饱和吸收介质的简并四波混频和全息随时间的变化行为进行了理论分析。
The optimum system architectures is the four-level computer network that centralizes the process of real-time tracing information in the computer centers at the railway bureau.
最佳的系统结构是以铁路局计算中心为实时追踪处理点的四级计算机网络。
Compared with three-level atomic system, the atomic coherence effects in four-level can lead to EIT and EIA, which depend on the intensity of control light and the relaxation of the fourth level.
与三能级原子系统相比，四能级原子相干效应即可导致电磁感应透明的产生，也可产生电磁感应吸收现象，取决于控制光的强度和第四个能级衰变率的大小。
The paper introduces the Germanic satellite positioning and navigation service. According to its precision, respond time, its purpose, it was divided into four-level service.
本文介绍德国的卫星定位与导航服务，及其按精度、时间响应和目的所分成的四个级别的服务。
We studied the optical bistability for four-level system with single and triple state typical of organic media.
对一种有着单重态和三重态的典型的有机物的四能级系统的光学双稳进行了研究。
We studied the optical bistability for four-level system with single and triple state typical of organic media.
对一种有着单重态和三重态的典型的有机物的四能级系统的光学双稳进行了研究。
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