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。
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。
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 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。
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 Kerr nonlinearity of a left-handed material is analyzed in a four-level atomic system.
分析了四能级原子系统中左手材料的克尔非线性特性。
In the distribution network, the implementation of four - level management is the most effective means of reducing losses.
在配网中实施“四分管理”是最有效的降损手段。
Phase conjugation of backward-and forward-wave produced by degenerate four-wave mixing using a nearly resonantly enhanced nonlinearity in four-level organic dye solutions was investigated.
研究了近共振增强的四能级系统有机染料溶液中简并的四波混频后向反射波及前向波的位相复共轭特性。
The four-level flexible office space holds most of the usual workplace amenities, such as individual offices, conference rooms and rest areas.
四层灵活办公空间拥有最普通的办公设施，如私人办公室、会议室、休息区等。
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 concept was to create a four-level diaphanous structure, which integrates all functions of living and working and yet offers enough privacy.
设计理念是创造出一个四层的透明体量，将所有的起居和办公功能都包含在一起，但同时为住户提供极大的隐私性。
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。
Video content is described by characteristics extracted on four-level framework including shots, video objects, video object planes and video object regions.
本文提出了一种基于视频对象的视频内容分级描述模型。
And we can find the deep-seated reasons of Ling Shan's success by analyzing with the four-level model of cultural tourism products, which proves that the evaluation system is reasonable.
运用文化旅游产品的四层次评价模型对灵山文化旅游产品进行剖析可以发现其成功的深层次理由，同时也证明了模型的合理性。
This paper describes in detail the method to analyze the Phase jitter in the four-level PWM fibre optic communication systems.
本文详细介绍了四进制pwm光纤通信系统相位抖动的分析方法。
The 18-metre high, four-level winery is built into the hillside and blends into the environment with its tussock covered roof.
酿酒厂建于山上，是幢18米高的四层建筑，屋顶覆盖着草皮。
The rate equation of tunable pulse ti: sapphire laser is given using the theoretical model of four-level system.
以四能级系统为理论模型对脉冲可调谐掺钛蓝宝石激光系统建立了速率方程。
In this paper, a direct instantaneous torque control (DITC) of switched reluctance motor (SRM) with a four-level converter is presented.
主要论述了基于四电平功率变换电路的开关磁阻电机直接瞬时转矩控制。
A simplified analytical expression of maximum single frequency output is obtained by the analysis of a homogeneously broadened four-level system;
通过对四能级均匀加宽激光器单频功率的分析得到最大单频输出功率的简化解析结果；
In this paper, we use the dressed-atom approach to derive the analytical expression of the gain of a FIR laser with a four-level system.
本文用缀饰原子方法解出四能级系统远红外激光增益系数的解析表达式。
In this paper, we use the dressed-atom approach to derive the analytical expression of the gain of a FIR laser with a four-level system.
本文用缀饰原子方法解出四能级系统远红外激光增益系数的解析表达式。
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